US2336072A - Treatment of metals - Google Patents
Treatment of metals Download PDFInfo
- Publication number
- US2336072A US2336072A US422875A US42287541A US2336072A US 2336072 A US2336072 A US 2336072A US 422875 A US422875 A US 422875A US 42287541 A US42287541 A US 42287541A US 2336072 A US2336072 A US 2336072A
- Authority
- US
- United States
- Prior art keywords
- solution
- phosphate coating
- metals
- treatment
- coating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 229910052751 metal Inorganic materials 0.000 title description 8
- 239000002184 metal Substances 0.000 title description 8
- 150000002739 metals Chemical class 0.000 title description 5
- 238000000576 coating method Methods 0.000 description 24
- 239000011248 coating agent Substances 0.000 description 23
- 229910019142 PO4 Inorganic materials 0.000 description 15
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 15
- 239000010452 phosphate Substances 0.000 description 15
- 150000001875 compounds Chemical class 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000002253 acid Substances 0.000 description 5
- 150000002894 organic compounds Chemical class 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 125000003866 trichloromethyl group Chemical group ClC(Cl)(Cl)* 0.000 description 5
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- ONDPHDOFVYQSGI-UHFFFAOYSA-N zinc nitrate Chemical compound [Zn+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ONDPHDOFVYQSGI-UHFFFAOYSA-N 0.000 description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 3
- 239000011701 zinc Substances 0.000 description 3
- 229910052725 zinc Inorganic materials 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910002651 NO3 Inorganic materials 0.000 description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- YNJBWRMUSHSURL-UHFFFAOYSA-N trichloroacetic acid Chemical compound OC(=O)C(Cl)(Cl)Cl YNJBWRMUSHSURL-UHFFFAOYSA-N 0.000 description 2
- 229960004319 trichloroacetic acid Drugs 0.000 description 2
- MFXMOUUKFMDYLM-UHFFFAOYSA-L zinc;dihydrogen phosphate Chemical compound [Zn+2].OP(O)([O-])=O.OP(O)([O-])=O MFXMOUUKFMDYLM-UHFFFAOYSA-L 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000005749 Copper compound Substances 0.000 description 1
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 150000001880 copper compounds Chemical class 0.000 description 1
- 229910001431 copper ion Inorganic materials 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- STZCRXQWRGQSJD-GEEYTBSJSA-M methyl orange Chemical compound [Na+].C1=CC(N(C)C)=CC=C1\N=N\C1=CC=C(S([O-])(=O)=O)C=C1 STZCRXQWRGQSJD-GEEYTBSJSA-M 0.000 description 1
- 229940012189 methyl orange Drugs 0.000 description 1
- 150000002823 nitrates Chemical class 0.000 description 1
- 150000002826 nitrites Chemical class 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- HFFLGKNGCAIQMO-UHFFFAOYSA-N trichloroacetaldehyde Chemical compound ClC(Cl)(Cl)C=O HFFLGKNGCAIQMO-UHFFFAOYSA-N 0.000 description 1
- -1 zinc nitrate Chemical compound 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/07—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
- C23C22/08—Orthophosphates
Definitions
- This invention relates to the treatment of metals, especially iron or steel, for instance to the treatment of metals with phosphate coating solutions in order to improve the resistance of the metals to corrosion or to provide a corrosionresisting base for paints.
- This application is a continuation in part of application, Serial No. 254,238, filed February 2, 1939, issued September 15, 1942, as Patent No. 2,295,545.
- pecially phosphate coating solutions can be ac-' celerated by incorporating therein a trichloromethyl group.
- the optimum concentration of the acceleratins compound in the reagent attacking the metal surface difiers with different compounds but in the case of phosphate coating solutions is in general from about .01% to .4% by weight of the solution.
- the proper amount of accelerator for best results may be easily determined in any case by starting the solution 011 with a small amount of the accelerator and increasing the amount added to the phosphate coating solution until the desired acceleration is obtained.
- the cleaned steel sheet referred to here and in the examples given below is a steel sheet in its original'brlght rolled conditionrendered substantially free from grease by wiping with clean white spirit.
- Optimum Substance concentration ch10 Per cent 2 Trichlnr acid While compounds of the invention may be the only accelerators present in the coating bath, they may also be employed in conjunction with other accelerators, and in other acid phosphate coating solutions, for instance, metallic accelerators such as copper compounds, or oxidizing agents such as nitrates or nitrites. The presence of copper ions appears to promote heavier and darker coatings and the presence of a nitrate, such as zinc nitrate, appears to give a slight further acceleration.
- a composition comprising an acid phosphate coating solution containing as accelerator an organic compound which contains the trichloi'ometliyl group, said compound being dissolved in the solution in an amount which acceierates the coating action or the solution.
- a composition of matter comprising a zinc dihydrogen phosphate coating solution containing as accelerator an organic compound contain ing the tricnlorometnyl group, Sal-d compound 4.
- the process which comprises treating one of the group consisting of ferrous and zinciferous surfaces with a phosphate coating solution containing as accelerator an organic compound which itself contains a trichloromethyl group, said compoundlbeing. dissolved in the solution in an amountvthataaccelerates the coating action of the solution, until there is obtained .upon the metallic surface a phosphate coating bonded to: the metallic surface by chemical reaction therewith.
Landscapes
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
Description
Patented Dec. 7, 1943 TREATMENT OF METALS Wilfred James Clifford and Henry Hewai'd Adams, Brentford, England, assignors to Parker Rust-Proof Company tion of Michigan Detroit, Mich, a corpora- No prawing. Application December 13, 1941, Se-
l'lal No. 422,875. 'In Great Britain February 4,
1938 3 Claims.
This invention relates to the treatment of metals, especially iron or steel, for instance to the treatment of metals with phosphate coating solutions in order to improve the resistance of the metals to corrosion or to provide a corrosionresisting base for paints. This application is a continuation in part of application, Serial No. 254,238, filed February 2, 1939, issued September 15, 1942, as Patent No. 2,295,545.
It is an object of the invention to accelerate the action of reagents which attack a metal surface.
It is a further object of the invention to accelerate the action of phosphate coating solutions such as zinc and manganese, l. e. to reduce the time taken by the coatingsolution to form a complete coating, or to reduce the temperature,
pecially phosphate coating solutions, can be ac-' celerated by incorporating therein a trichloromethyl group.
Asillustrative of the compounds which may be employed to provide the trichloromethyl group, we have chloral and trichloroacetic acid and the like.
The optimum concentration of the acceleratins compound in the reagent attacking the metal surface difiers with different compounds but in the case of phosphate coating solutions is in general from about .01% to .4% by weight of the solution. The proper amount of accelerator for best results may be easily determined in any case by starting the solution 011 with a small amount of the accelerator and increasing the amount added to the phosphate coating solution until the desired acceleration is obtained.
The optimum concentrations, under the conditions used, of various compounds which may be employed according to the invention are given in the following table, the results being arrived at by adding the compound to a solution of zinc dihydrogen phosphate having a normality of 11/20 free acid (determined by titrating with-the aid of methyl orange indicator) and N/5 total acid (determined bytitrating with the aid of phenolphtbalein indicator) and treating a cleaned steel sheet for two minutes at 80 C.
The cleaned steel sheet referred to here and in the examples given below is a steel sheet in its original'brlght rolled conditionrendered substantially free from grease by wiping with clean white spirit.
Optimum Substance concentration ch10 Per cent 2 Trichlnr acid While compounds of the invention may be the only accelerators present in the coating bath, they may also be employed in conjunction with other accelerators, and in other acid phosphate coating solutions, for instance, metallic accelerators such as copper compounds, or oxidizing agents such as nitrates or nitrites. The presence of copper ions appears to promote heavier and darker coatings and the presence of a nitrate, such as zinc nitrate, appears to give a slight further acceleration.
If in any of the above examples 0.001% of copper (calculated as the metal) is added to the solution, for instance in the form of the nitrate or carbonate, a darker and slightly heavier coating is obtained, and the addition of zinc nitrate results in a slight further acceleration.
While the invention has been illustrated by the treatment of steel, it is also useful in the coating of other metallic surfaces, such as surfaces containing zinc and alloys thereof.
what we claim is;
l. A composition comprising an acid phosphate coating solution containing as accelerator an organic compound which contains the trichloi'ometliyl group, said compound being dissolved in the solution in an amount which acceierates the coating action or the solution.
2. A composition of matter comprising a zinc dihydrogen phosphate coating solution containing as accelerator an organic compound contain ing the tricnlorometnyl group, Sal-d compound 4. The process which comprises treating one of the group consisting of ferrous and zinciferous surfaces with a phosphate coating solution containing as accelerator an organic compound which itself contains a trichloromethyl group, said compoundlbeing. dissolved in the solution in an amountvthataaccelerates the coating action of the solution, until there is obtained .upon the metallic surface a phosphate coating bonded to: the metallic surface by chemical reaction therewith.
5. The process which comprises treating one of the group consisting of ferrous and zinciferous surfaces with a phosphate coating solution containing zinc and as accelerator an organic compound having a trichloromethyl group said compound beingdissolved in the solution in an amount that accelerates the coating action of the' solution, until there is obtained upon the metallic surface a phosphate coating bonded thereto by chemical reaction. i v
6. The process which comprises treating one of the group consisting of ferrous and zinciferous surfaces with a phosphate coating solution containing manganese and as accelerator an organic compound having a trichloromethyl group, said compound being dissolved in the solution in an A tion, until a visible protective phosphate coat- 1 ing is obtained upon the metallic surface.
8. The process which comprises treating a surface of one of the group consisting of ferrous and *zinciferous surfaces with a phosphate coating solution containing trichloracetic acid, in an amount that accelerates the coating action of the solution, until a visible protective phosphate coating is obtained upon the metallic surface.
WILFRED JAMES CLIFFORD. HENRY HEWARD ADAMS.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2336072X | 1938-02-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2336072A true US2336072A (en) | 1943-12-07 |
Family
ID=10904096
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US422875A Expired - Lifetime US2336072A (en) | 1938-02-04 | 1941-12-13 | Treatment of metals |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2336072A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2640395A (en) * | 1945-05-09 | 1953-06-02 | Clark Kendall | Gun training mechanism |
| US2657156A (en) * | 1948-07-23 | 1953-10-27 | Parker Rust Proof Co | Phosphate coating composition and process |
-
1941
- 1941-12-13 US US422875A patent/US2336072A/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2640395A (en) * | 1945-05-09 | 1953-06-02 | Clark Kendall | Gun training mechanism |
| US2657156A (en) * | 1948-07-23 | 1953-10-27 | Parker Rust Proof Co | Phosphate coating composition and process |
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